Given x + 1 / x-3 = 0, find the value of 1 / x ^ 4 + 1 / x ^ 2 + 1 + x ^ 2 + x ^ 4 Given x ^ 2 / y ^ 2-4x / y + 4 = 0, find the value of fraction x ^ 2-y ^ 2 / XY

1. From x + 1 / x-3 = 0, the denominator cannot be 0, then x + 1 = 0
x=-1
1 + 1 + 1 + 1 + 1 = 5
2. Take X / y as a whole Z
The original formula = (Z-2) & sup2; = 0, then z = 2, namely X / y = 2, x = 2Y
It is shown that 4Y & sup2; - Y & sup2; / 2Y & sup2; = 3 / 2

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